Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 52, Issue 3, Pages 889-896Publisher
SPRINGER
DOI: 10.1007/s11661-021-06138-3
Keywords
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Funding
- Army Research Laboratory, USA [W911NF-18-2-0067, W911NF1920011]
- National Science Foundation [1435810]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1435810] Funding Source: National Science Foundation
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This short review paper explores the uniqueness of metastable high entropy alloys (HEAs) that transform during plastic deformation, emphasizing the linkages among alloy design induced metastability, processing induced high enthalpy states, and evolving deformation mechanisms. The adaptive nature of deformation mechanisms and the activation of different micromechanisms during plasticity play a crucial role in the strength-ductility synergy and exceptional fatigue strength of metastable HEAs.
This short review paper examines the uniqueness of metastable high entropy alloys (HEAs) that transform during plastic deformation. The linkages among alloy design induced metastablilty, processing induced high enthalpy states and evolving deformation micromechanisms are intriguing. One key aspect is the adaptive nature of deformation mechanisms because of activation of different micromechanisms during plasticity. This activation of deformation micromechanisms is attributed to transformation-induced plasticity in gamma-f.c.c. phase and the evolving nature of c/a ratio in the epsilon-h.c.p. phase during deformation. As a result, metastable HEAs have good strength-ductility synergy and exceptional fatigue strength.
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